[cisco-voip] Radio caused reboot of IP phones

[Bill Talley]

I just tested with a 7941.  I my case, the phone did not reset and active
calls were not affected, however, the display does dim significantly when a
radio is keyed within a foot or so of the phone.

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Matt Slaga (US)
Sent: Tuesday, March 11, 2008 11:00 AM
To: Brad Rogers; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Radio caused reboot of IP phones

 

The 7940 and 7960s both have 400mhz processors.  If you place excessive
radio frequencies in that range near one of these phones, yes it will
confuse the poor thing.

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Brad Rogers
Sent: Tuesday, March 11, 2008 9:49 AM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Radio caused reboot of IP phones

 

>From what I understand, this is specific to a certain manufacturing run of
7940's and 7960's.    When they were manufactured they left out the RF
shield.  When this happened to us we replaced some phones with new ones and
it fixed the problem.

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of JASON BURWELL
Sent: Monday, March 10, 2008 9:59 PM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Radio caused reboot of IP phones

 

It seems to me the more urgent concern in this situation might be the
radio's user being exposed to that level of RF radiation on a daily basis.
If it is sending out enough TX wattage to make a 7941 reset, that can't be
good for the body. 

 

Jason

 

  _____  

From: cisco-voip-bounces at puck.nether.net on behalf of Wes Sisk
Sent: Mon 3/10/2008 4:53 PM
To: Scott Voll
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Radio caused reboot of IP phones

Known issue and not much we can do about it.  Phone has to be susceptible to
RF interference by FCC rqmt.  Some phone models are more/less susceptible by
housing insulation, but all do reset with enough RF close enough.

/Wes

Scott Voll wrote: 

Has anyone seen this before.

 

one of our sites uses Kenwood ProTalk radios.  if you key the radio the IP
phone (794x) phone reboots.  Totally reproducable.  Key the button reboot.  

 

Is this a know bug?  anyway to fix it?  in the event of an emergency when
both phone an radio are needed, this could be really bad news!

 

TIA

 

Scott

 
 
 
 



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